hi, im seeing the same behavior as you on my 16 pro max 1tb. ive also read on reddit that others are experiencing similar issues. i think you router is fine.

ive got the same router. v1.6 latest firmware. 5gig frontier service. wired speeds are 5.5 up/down. ive got about 40 iot devices on the iot network. ive got mlo activated as well as smart connect....

@Richardj186 , appreciate you posting about this -- seems you are invested in wanting the best for your family's needs. Im in the market for a wifi7 device, currently have the axe300 and 5g service...